Alireza's questions

First netstat -nltp output displays:

tcp        0      0 0.0.0.0:27017           0.0.0.0:*               LISTEN      1235/mongod

So it seems that MongoDB is running on port 27017 and accept connection from all IPs.

Just to make sure MongoDB is up and running I issued mongo command to make sure I can see mongoDB:

mongo --port 27017 -u "MyUser" --authenticationDatabase "admin" -p 'MyPassword'

MongoDB shell version v4.2.8
connecting to: mongodb://127.0.0.1:27017/?authSource=admin&compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("00000000-d8c3-422a-9446-38eb624dd88f") }
MongoDB server version: 4.2.8

Now I tried tcptraceroute command to make sure nothing in between closes my connection:

$ sudo tcptraceroute My-Server-IP-Address 27017
Password:
Selected device en0, address 192.168.1.55, port 54871 for outgoing packets
Tracing the path to My-IP-Address on TCP port 27017, 30 hops max
 1  192.168.1.1  8.847 ms  3.853 ms  0.994 ms
 2  * * *
 3  10.101.96.93  26.486 ms  24.977 ms  27.186 ms
 4  10.101.105.14  41.399 ms  30.886 ms  16.155 ms
 5  * * *
 6  10.101.97.57  24.635 ms  29.538 ms  17.545 ms
 7  10.101.117.25  39.587 ms  47.088 ms  62.840 ms
 8  * * *
 9  10.21.251.106  29.101 ms  29.739 ms  34.785 ms
10  10.21.21.22  35.107 ms  19.941 ms  20.011 ms
11  10.21.211.20  49.572 ms  33.257 ms  34.870 ms
12  * * *
13  * * *
14  ex9k1.dc5.fsn1.A-DOMAIN.com (AN-IP-ADDRESS)  93.807 ms  108.962 ms  115.046 ms
15  static.ANOTHER-IP.clients.your-server.it (IP-ADDRESS-IT)  99.938 ms  102.719 ms  109.238 ms
16  static.MY.IP.ADDRESS.clients.your-server.de (MY.IP.ADDRESS) [closed]  173.753 ms  112.972 ms  102.902 ms

On last hop I see [closed] flag.

To list all server firewall rules:

$ sudo iptables -L -n 
-> # sudo iptables -L -n
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination
DOCKER-USER  all  --  0.0.0.0/0            0.0.0.0/0
DOCKER-ISOLATION-STAGE-1  all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0            ctstate RELATED,ESTABLISHED
DOCKER     all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain DOCKER (1 references)
target     prot opt source               destination
ACCEPT     tcp  --  0.0.0.0/0            172.18.0.3           tcp dpt:80

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target     prot opt source               destination
DOCKER-ISOLATION-STAGE-2  all  --  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-ISOLATION-STAGE-2 (1 references)
target     prot opt source               destination
DROP       all  --  0.0.0.0/0            0.0.0.0/0

Chain DOCKER-USER (1 references)
target     prot opt source               destination
RETURN     all  --  0.0.0.0/0            0.0.0.0/0

Chain ufw-after-forward (0 references)
target     prot opt source               destination

Chain ufw-after-input (0 references)
target     prot opt source               destination

Chain ufw-after-logging-forward (0 references)
target     prot opt source               destination

Chain ufw-after-logging-input (0 references)
target     prot opt source               destination

Chain ufw-after-logging-output (0 references)
target     prot opt source               destination

Chain ufw-after-output (0 references)
target     prot opt source               destination

Chain ufw-before-forward (0 references)
target     prot opt source               destination

Chain ufw-before-input (0 references)
target     prot opt source               destination

Chain ufw-before-logging-forward (0 references)
target     prot opt source               destination

Chain ufw-before-logging-input (0 references)
target     prot opt source               destination

Chain ufw-before-logging-output (0 references)
target     prot opt source               destination

Chain ufw-before-output (0 references)
target     prot opt source               destination

Chain ufw-reject-forward (0 references)
target     prot opt source               destination

Chain ufw-reject-input (0 references)
target     prot opt source               destination

Chain ufw-reject-output (0 references)
target     prot opt source               destination

Chain ufw-track-forward (0 references)
target     prot opt source               destination

Chain ufw-track-input (0 references)
target     prot opt source               destination

Chain ufw-track-output (0 references)
target     prot opt source               destination

And lastly my telnet output:

$ telnet MY-IP 27017
Trying MY-IP...
telnet: connect to address MY-IP: Connection refused
telnet: Unable to connect to remote host

What I have done wrong? What should I do to connect to MongoDB from outside?

EDIT:

By changing port from 27017 to 27018, I could connect to MongoDB and everything works fine. But I'm still curious why I cannot use 27017 port and what I have done wrong in iptables configuration?

NOTE: ufw firewall is disabled.

bash exits immediately to solve this problem I had press ALT+F2 and then set terminal to sh rather than bash. I ran sh and commented out the section which I added for kubectl bash completion:

source <(kubectl completion bash)

Now in sh when I enter bash it displays kubectl usage:

bash <search term> [-h] [-c] [-n] [-t] [-l] [-d] [-p] [-s] [-b] [-k] [-v] [-r] [-i] -- tail multiple Kubernetes pod logs at the same time
...

Why this happens? I even tried to reinstall bash but it again exits unexpectedly! How should I fix this issue?

~/.bashrc content:

unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# colored GCC warnings and errors
#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi
#source <(kubectl completion bash)

~/.bashprofile file does not exist.

~/.profile file content:

# ~/.profile: executed by the command interpreter for login shells.
# This file is not read by bash(1), if ~/.bash_profile or ~/.bash_login
# exists.
# see /usr/share/doc/bash/examples/startup-files for examples.
# the files are located in the bash-doc package.

# the default umask is set in /etc/profile; for setting the umask
# for ssh logins, install and configure the libpam-umask package.
#umask 022

# if running bash
if [ -n "$BASH_VERSION" ]; then
    # include .bashrc if it exists
    if [ -f "$HOME/.bashrc" ]; then
        . "$HOME/.bashrc"
    fi
fi

# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/bin" ] ; then
    PATH="$HOME/bin:$PATH"
fi

# set PATH so it includes user's private bin if it exists
if [ -d "$HOME/.local/bin" ] ; then
    PATH="$HOME/.local/bin:$PATH"
fi

The output of the grep command is as follow:

$ grep -H kube ~/.bashrc ~/.profile ~/.bash_profile ~/bash.login ~/.bash_aliases /etc/bash.bashrc /etc/profile /etc/profile.d/* /etc/environment 2> /dev/null
/home/MyUserName/.bashrc:#source <(kubectl completion bash)

Multiple packages upgraded like gem, ruby and its plugins. Now when I run vagrant up I get:

Vagrant failed to initialize at a very early stage:

The plugins failed to initialize correctly. This may be due to manual
modifications made within the Vagrant home directory. Vagrant can
attempt to automatically correct this issue by running:

  vagrant plugin repair

If Vagrant was recently updated, this error may be due to incompatible
versions of dependencies. To fix this problem please remove and re-install
all plugins. Vagrant can attempt to do this automatically by running:

  vagrant plugin expunge --reinstall

Or you may want to try updating the installed plugins to their latest
versions:

  vagrant plugin update

Error message given during initialization: Unable to resolve dependency: 'fog-libvirt (>= 0.3.0)' requires 'ruby-libvirt (>= 0.7.0)'

I even removed the whole vagrant by sudo apt-get remove --purge vagrant but after fresh installation error keeps showing.

I tried to reinstall sudo gem install ruby-libvirt but nothing happened.

Is there something that I can try on Ubuntu to solve this problem and make vagrant up & running?

EDIT-1:

vagrant plugin repair displays:

Repairing currently installed plugins. This may take a few minutes...
Failed to automatically repair installed Vagrant plugins. To fix this
problem remove all user installed plugins and reinstall. Vagrant can
do this for you automatically by running the following command:

  vagrant plugin expunge --reinstall

Failure message received during repair:

Unable to resolve dependency: user requested 'vagrant-libvirt (> 0)

Then using vagrant plugin expunge --reinstall:

This command permanently deletes all currently installed user plugins. It
should only be used when a repair command is unable to properly fix the
system.

Continue? [N]: Y

All user installed plugins have been removed from this Vagrant environment!

Vagrant will now attempt to reinstall user plugins that were removed.

As far as I know PATH is not a temporary variable. And when you reopen your terminal it should work as before. In my case it's not.

What I do is to add another path to $PATH:

export PATH=$PATH:/usr/local/go/bin

It should append go dir to PATH variable and it does do that, but when I reopen terminal and echo $PATH my last appended path is cleared and I have my paths without /usr/local/go/bin at the end.

What is the reason this is happening? Is there something I'm doing wrong?

I wanted to install teamviewer on linux 64-bit system.

What I did was to download teamviewer.deb file and install it as below:

sudo dpkg -i install teamviewer.deb

Then I wanted to correct dependency problem so I issued the following command:

sudo apt-get install libc6:i386 libgcc1:i386 libasound2:i386 libfreetype6:i386 zlib1g:i386 libsm6:i386 libxdamage1:i386 libxext6:i386 libxfixes3:i386 libxrender1:i386 libxtst6:i386  

I got the following error:

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies

I then tried:

sudo apt-get install -f  

Again I got the following error:

E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
E: Unable to correct dependencies

Even I tried to install gdebi, but I got the above error again.

I emptied archives folder:

sudo apt-get clean  
sudo apt-get update  
sudo apt-get upgrade

Again I have problem installing my deb package. Is there anything I could do now to solve this problem?

I've read the below article as well:

Installed Teamviewer using a 64-bits system, but I get a dependency error

EDIT:

I found libperl5.14:amd64 as a broken package. I used:

sudo apt-get remove libperl5.14:amd64  

I got the following message:

E: Unable to locate package Broken

This is my whole apt.log file. I found a few more broken packages. I've done the same thing and got the same message.

EDIT 2:

I tried to install teamviewer_linux.deb via software center and I found repair button I clicked it and again I got the error below:

This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.    

even after package removal and installing it via software center I got the error below:

Can not install 'libfreetype6:i386'  

EDIT 3:

Can sources.list affect the process of installing deb packages? This is the only thing I'm suspicious of!

EDIT 4:

When after that I type sudo apt-get install -f I get this message:

Reading package lists... Done
Building dependency tree      
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 18 not upgraded

EDIT 5:
Output of sudo dpkg -i teamviewer_linux.deb:

dpkg: error processing package teamviewer (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
teamviewer

I've done tons of search and tested different solutions, but gain no success!

When I want to push my codes, I receive the following error:

Warning: the ECDSA host key for 'git.mywebsite.ir' differs from the key for the IP address '164.138.23.11'
Offending key for IP in /home/alireza/.ssh/known_hosts:10
Matching host key in /home/alireza/.ssh/known_hosts:1
Are you sure you want to continue connecting (yes/no)? yes

What should I do to remove this message every time I push my changes? Any idea?

I have Ubuntu 13.10 on both of My Laptop and PC. I've installed many applications on my PC.
I don't want to download all these apps again and reinstall them on Laptop. What method should I take to copy installed app into another Ubuntu?

When I run the following command:

wine '/var/www/psiphon.exe'

I get the below error:

fixme:storage:create_storagefile Storage share mode not implemented.
err:mscoree:LoadLibraryShim error reading registry key for installroot
fixme:seh:RtlAddFunctionTable 0x4c6ea0 1 4a0000: stub
fixme:seh:RtlAddFunctionTable 0x68f5b6a0 1 68f40000: stub
fixme:iphlpapi:NotifyAddrChange (Handle 0xece278, overlapped 0xece240): stub
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
fixme:storage:create_storagefile Storage share mode not implemented.
fixme:ntdll:find_reg_tz_info Can't find matching timezone information in the registry for bias -210, std (d/m/y): 22/09/2014, dlt (d/m/y): 22/03/2014
err:mscoree:LoadLibraryShim error reading registry key for installroot
err:mscoree:LoadLibraryShim error reading registry key for installroot
fixme:iphlpapi:NotifyAddrChange (Handle 0x11de8ac, overlapped 0x11de890): stub
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory
wine: configuration in '/root/.wine' has been updated.
fixme:heap:HeapSetInformation (nil) 1 (nil) 0
fixme:ras:RasEnumEntriesW ((nil),(null),0x143180,0x33fa14,0x33fa1c),stub!
fixme:wininet:INET_QueryOption INTERNET_OPTION_PER_CONNECTION_OPTION stub
fixme:heap:HeapSetInformation (nil) 1 (nil) 0
p11-kit: couldn't load module: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: /usr/lib/i386-linux-gnu/pkcs11/p11-kit-trust.so: cannot open shared object file: No such file or directory

The program gets started, but does not open filtered sites.

In firefox I've set: Use system proxy settings. Psiphon gives error 404 bad request when psiphon gets connected.

We have 4 PCs connected to each other. We all download our apps through Internet which uses our Internet bandwidth. Is there a way to share downloaded softwares through network to prevent others from downloading the same thing through Internet.

When I try to install a 32 bit program on ubuntu 13.10 64bit it falis. My command is as follow:

linux32 ./setup.sh

Output is:

The setup program seems to have failed on x86/unknown

Fatal error, no tech support email configured in this setup

Is there a way to install 32bit program on ubuntu 13.10? When running the following command:

./setup.sh

The output is as below:

The setup program seems to have failed on amd64/unknown

Fatal error, no tech support email configured in this setup

In unity I used to run system settings->network to establish a DSL connection with username and password. I've switched to xfce for better performance. Now the problem is that I can't find such a thing in xfce.

In terminal I typed: nm-connection-editor command, but it's not installed. I removed Unity from Ubuntu software center. Is there a way to make Internet up and running as before?

When I run the following command in terminal:

php somePHPfile.php

The following error happens:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php5/20100525/gearman.so' - /usr/lib/php5/20100525/gearman.so: cannot open shared object file: No such file or directory in Unknown on line 0

I've installed gearman and gearmanAdmin. The gearman.so is not present in the /usr/lib/php/20100525/ path.

I've installed gearman from source. Gearman's version is 1.1.5 is installed.

I have on gearman.so in the following path:

/usr/lib/x86_64-linux-gnu/libgearman.so.6.0.0

Is there a way in Ubuntu to test your Ethernet adapter to see whether it's working correctly or not?

I had internet connection, but when I upgraded my VGA and restarted my PC then everything for eth0 has gone.

When I used ifdown:

 ifdown: interface eth0 not configured

Is there something I could do?

EDIT:
Content of /etc/network/interfaces

auto lo
iface lo inet loopback

When I ifconfig I don't have these lines:

inet addr:192.168.1.5  Bcast:192.168.1.255  Mask:255.255.255.0
inet6 addr: fe80::219:5bff:fe5e:a5e/64 Scope:Link

In the Terminal typed:

sudo gedit /etc/network/interfaces

and then added these lines in the bottom:

auto eth0
iface eth0 inet dhcp

then I typed:

sudo ifdown eth0
sudo ifup eth0

when I send the second command I received the below message:

No DHCPOFFERS received
No working leases in persistent database - sleeping

Any help?